There was a 6 bladed prop on a Deperdussin in 1911(or 1910?) Paris Show, and I have a postcard showing the same at Reims 1911 "Concours Militaire". Both seem to be a combination of three 2 bladed prop (and probably the very same prop), and not a one piece construction as Anne prop.
This 6 blades prop mounted on Deperdusssin was patented ( http://worldwide.espacenet.com/publi...C&locale=en_EP ). We have a letter showing it was Ratier who mounted the prop on the aircraft for the 1911 Paris Air Show, so we think it have been made by Ratier when they were making "Rapid" props.

Also, blades shape look different, but it is the only 6 blades I heard of.